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I believe the ECM computer is programmed to turn on the first fan at about 223 degrees, and the second fan at about 240 degree or above. So, the engine temp. is maintained at about 223 degree at least by the first fan, and the temperature gauge is about a quarter passed the half way point, as you said. Since ECM is programmed by GM, there must be a tech. reason why engine temp. is kept this way! ( not at the half way point, like many newer cars)
Since you just doing the ignition works, I will first make sure that the sparks are getting ignition voltages from the coils, using a spark plug's light tester available at most auto parts stores, who can tell you how to use it, not too difficult.
check the pressure line,hose&fittings to see if they are wet, if so then you know what leaking. need two correct sizes wrenches to unconnect and reconnect the new hose.
Happened to me, I replaced to a new sensor. The light still came on for awhile, but later disappear for good. May be the ECU needs some times to adjust!?
I think it is IAC (idle air control valve). It locates near the air throttle body. removing two bolts and the IAC can be taken out to check or replace. Also check if the air channel is clogged. good luck
Either ignition system or fuel system or both, is the problem. Check ignition system is easier, go buy a spark plug test, which can insert between the coil electrode and the spark plug wire. It will light up and blink if that spark plug, its wire and its coil work okay. Test all spark plugs and wires. If all okay, now need to check fuel system, go loan a fuel pump test gauge from an auto store, there is a port on the fuel rail that you can connect the test gauge to. Read instruction in details before you do it, since it involves fuel!! fire hazard!
I guess the engine's temperature was okay, while traveling, since you only mentioned hot while idleing. Then, you may be right about the Fan or Fans, not working. If I remember correctly there are two fans or even three fans: one fan from engine's crankshaft behind the radiator, another fan in front of radiator for Air-conditoner's condensor. You can check them by idling the engine, open the hood and look at the behind fan, it should turn on before 100 mark on temperature gauge. Then, turn on your Air-conditioner and check if the front fan turn on. If either not working, you need to take to a good mechanics soon, this can damage your engine from overheat!!!
For 95 Lumina-sedan, it locates below the ignition coil package near the firewall. You will have to rotate the engine to work on it!
There are two springs with studs holding the exhaust pipe to the rear exhaust manifold. The studs are inside the springs. What are the purpose of these springs? can I use any springs for replacement? thank you for your reply.
Will bad Exhaust Flange Gasket and/or Exhaust spring connecting the exhaust manifold to the exhaust pipe, cause a clunking noise when accelerating from a stop? Thank you for your reply!
Chevy Lumina 95 3.1L V6 engines do not use iginition distributor and its shaft, so there is a circular cover on top the engine on the driver side, near the ridge between the two cylinder heads. Also there seems to be a screwed-in metal plate that locks this lid! Can this circular metal lid/cover leak out engine's oil, if not installed well? Thanks for your responses!
I had same issue. it depends on where the crack is: if it is in the open easily accessible, you buy a low-cost rubber hose, slightly bigger than the pcv hose, make a short section and put it over the crack area. Or buy a whole new hose from a GM dealer cosing about $40
Chevy Lumina 95 3.1L engine's lower intake manifold has only gaskets to seal the front and back cylinder heads. But, there is the ridge area of lower intake between the two slopes on top of the two cylinder heads. I check with GM dealer, and they do not have gaskets to seal the ridges against coolant & oil leakages. Any ones with experiences, please recommend a good RTV sealant against ridge leakages, or should I make myself a ridge gasket? what material to use for it? Thanks in advance.
For a new remaufactured V6 3.1L engine, does it require retorqued cylinder heads after break-in period? I did see some real small traces of coolant from the head gasket!
After started up the engine, the rpm gauge initially drops to about 600 rpm, then recovers to the normal idle rpm of about 900 rpm. what causes this hesitation? Note: the engine started up right the way without any rattling or difficulties; the spark plugs and wires are new as well as air filter, fuel filter and fuel pump. thank you for prompt responses
I am installing a new rebuilt engine for my Chevy Lumina-sedan 3.1L 1995. An instruction is to prelube the engine's internal before start it up. The engine does not have a distributor's shaft to turn the oil pump, so I plan to just crank the engine quickly a few times till the oil pressure light goes off, with the fuel pump and the spark plug ignition disable. Will this work or be sufficient to prelube? Thank you for your prompt replies.
Old hydrolyic valve lifters making moises, so I have them replaced with new lifters, but still making noises. So I have the new ones checked if there is oil in the lifters. There is no significant oil in them. I believe the lifters' oil supplies pipes and so on, need to be clean/cleared up for oil to flow better. I'd appreciate any recommendations for solvent or liquid solution used and methods!. Note the oil pump is working fine, with enough oil pressure. Thank you.
Want to buy a stated 90k-mile used chevy 3.1L V6 engine, do you know how to stress test the engine for piston compression, gaskets' leak and other old engines' problems? Thank you for your prompt reply!
My 95 Chevrolet Lumina-Sedan/Coupe 3.1L SFI OHV 6cyl, has some hydrolyic valve lifters stuck after the engine quits. The engine had been making tick-tag noises for awhile before. Now the engine can be restarted and run but very rough, not all cylinders running from open valves?. Can these stuck lifters be removed then replaced? what about the camshaft lobes? damaged? Want to replace both cylinder heads, will it work? Thank you in advance for your prompt advices.